Red/ Black Sexlinks

I have been reading about Black and red Sexlinks and would like to try and incubate some next week. I understand that a red roo and a Barred Rock hen would make a Black Sexlink- is that correct? I have a Comet roo and some Barred rocks, would that work? Or did I reverse that combination?

I have 8- 7 week old Red Sexlinks and very interested in what combination it takes to breed more
it can be a little confusing. I read that if you need pure breds that you need to find a reputable breeder because
even the ones you get from hatcheries aren't pure, I hope someone with more knowledge chimes in

I had some chicks hatched to a broody Rhode Island red hen by an australorp rooster and they are very nice egg layers. Only three hatched but they are alsmost all black with a little red around their necks. Very nice girls.